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UNITED STATES PATENT OFFICE.

JAMES E. CRONK, OF POUGHKEEPSIE, NEV YORK.

PUMP.

Specification of Letters Patent No. 23,453, dated April 5, 1859.

To all whom fit may concern:

Be it known that I, JAMES E. CRONK, of Poughkeepsie, in the county of Dutchess and State of New York, have invented a new and useful Improvement on the Dipigram Pump; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same.

Numerous attempts have been made in the construction of pumps, to give to them in the greatest degree lasting usefulness and adaptability, being at the same time ornamental and of compact dimensions, and at a cost cheap enough for the simplest purposes. These qualities are claimed for the following described pump, reference being had to the annexed drawings making a part of this specification, in which the same letters have reference to the same parts in each.

Figure l, is a perspective view of the pump. Fig. 2 is a transverse section showing the interior arrangement of the different parts.

A, is a cylindrical ring forming the chamber; B, the upper recess and shell; C, the lower recess and shell; D, the receiving pipe, E, the discharge pipe; F, the piston rod; G, the brake or lever; H, the upper dipigram of flexible material and conical form, firmly fastened at the center to the rod F, and around its circumference between the ring A, and the shell B, forming the packing thereto. I, the lower dipigram, the same as H, and fastened to the rod F, and between the ring A, and the shell C, in the same manner. A, B, and C, are firmly bolted together, forming the entire shell or body of the pump. The upper dipigram H, is entire, while the lower one I, has an opening and valve at J, or its equivalent; K, the lower valve.

Operation-The operation is thus: In ascending, the lower dipigram causes all the space between the two Valves J, and K, to be filled to its full extent as represented in Fig. 2. In descending, the upper valve J, opens, and the lower valve K being closed, both dipigrams assume an inverted position, the space between the two dipigrams is filled and the surplus discharged at E. In the ascended position, the peculiar form of the shell B, causes a corresponding contraction of the upper dipigram H, which diminishes the space between the two dipigrams, and gives a consequent additional discharge at E.

Disclaimer-I do not claim to be the inventor of dipigrams or dipigram pumps. I therefore disclaim as such, the dipigrams H, and I; also the valves J, and K; the pipes D and E; the rod F, and the brake or lever G.

Vhat I claim as my invention and desire to secure by Letters Patent, is

The peculiar form and arrangement of the dipigrams H and I, with the shells B, and C as before described, and the ring A, forming a chamber between them with the discharge therefrom as before mentioned and for the uses and purposes herein expressed.

JAMES E. CRONK. lVitnesses GRIFFIN VRIPPIK, VILLLAM D. JONES. 

